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Europe’s data-center market is not slowing; it is becoming selective. Demand from AI, cloud migration, digital services and sovereign-computing programmes remains exceptionally strong, but new capacity is increasingly limited by deliverable electricity, grid connection dates, permitting, cooling and community acceptance. CBRE forecasts vacancy of 6.5% at the end of 2026 while expecting more than 750 MW of new European capacity, a combination that shows supply is growing but demand is growing faster.
The investment question has therefore changed. A site with land and a headline grid offer is not necessarily a viable data center. The strongest projects can prove firm power, a credible energisation schedule, suitable cooling, customer demand, regulatory compliance and an acceptable environmental footprint.
The market is shifting from expansion to selective growth
For much of the previous cycle, developers could compete primarily on location, capital and customer relationships. In 2026, power delivery is becoming the principal gate. Projects also compete for substations, transmission capacity, permits, construction equipment, water resources, skilled labour and local support.
Cushman & Wakefield describes the EMEA market as entering “selective growth”, with power, grid access, regulation and sustainability increasingly determining where capacity can actually be delivered. Established FLAP-D hubs—Frankfurt, London, Amsterdam, Paris and Dublin—retain dense fibre, carriers, customers and talent, but expansion is harder because of land scarcity, congestion, planning limits, water concerns and local opposition.
This is not the end of those hubs. It is a broader location race in which secondary markets can win projects when they offer a better combination of electricity, fibre, land, permitting and customers.
What the latest numbers mean
| Metric | Signal | How to read it |
|---|---|---|
| European vacancy | 6.5% forecast at end-2026 | CBRE forecast covering primary and secondary European markets; it is not a universal rate for every city or facility type. CBRE |
| Q1 2026 vacancy | 7.3% year over year | A point-in-time figure in CBRE’s global-trends analysis, not a contradiction of the year-end forecast. CBRE |
| New 2026 capacity | More than 750 MW expected | New supply can rise while vacancy falls when demand grows faster. CBRE |
| Frankfurt pricing | $235–$265 per kW/month | CBRE’s Q1 2026 comparison for 250–500 kW; it is not a European-wide tariff. CBRE |
| Construction cost | About $11.3 million per MW in 2026 | JLL global average forecast, with a 6% annual increase; country, specification and power-delivery costs vary materially. JLL |
| EU reporting threshold | Above 500 kW power demand | Reporting obligations under the current EU framework; this is not a universal operating ban. European Commission |
Demand is diverse, and AI changes the physical specification
Hyperscale and ordinary cloud
Hyperscalers continue to prelease and develop large blocks, while SaaS, streaming, storage, cybersecurity, analytics and enterprise migration provide the baseline demand that existed before the AI boom.
AI training, inference and GPU services
AI is an incremental demand engine, not the entire market. Training clusters need very dense racks, substantial electrical distribution and advanced heat rejection. Inference can be more geographically distributed because response time and proximity to users matter. GPU-as-a-service and “neocloud” providers add customers with different contract and utilisation patterns.
Existing floor space is not automatically AI-ready. A retrofit may require liquid cooling, stronger electrical busways, higher floor loading, new network fabrics, additional backup systems and technicians familiar with high-density operations. Any “AI-ready” claim should specify maximum rack density, cooling architecture, power topology and commissioning date.
Sovereign and strategic computing
European institutions increasingly link domestic or regionally controlled infrastructure with resilience, security and strategic autonomy. The proposed Cloud and AI Development Act would support cloud capacity, AI factories, AI gigafactories and energy-efficient data centers, but it remains a proposal rather than automatically binding law. European Commission
Power—not land—is drawing the market map
“Power available nearby” is different from power contractually deliverable by the required date. Developers and investors must trace the complete chain:
- Generation available in the wider region.
- Transmission capacity to move electricity to the area.
- Distribution capacity at the site.
- The connection queue and its timing.
- Whether the offer is firm, phased, interruptible or conditional.
- Substation and network upgrades, including who funds them.
- Power quality, redundancy, voltage stability and outage exposure.
- Electricity cost, volatility, carbon intensity and renewable sourcing.
An announced gigawatt is not operational supply. A permitted site may still lack an energised substation, and a connection offer is not the same as a live connection. CBRE says lengthy grid queues are prompting operators to examine on-site generation, while warning that it adds cost and reporting complexity. CBRE
Where secondary markets can compete
There is no reliable country league table based on cheap electricity alone. A credible location scorecard should examine:
- Firm capacity and connection-date confidence.
- Fibre routes, carrier choice, latency and cloud on-ramps.
- Land, zoning, tax and construction costs.
- Permitting speed and local-government support.
- Renewable availability, price volatility and carbon intensity.
- Climate, cooling design, water stress and waste-heat demand.
- Skilled labour, political stability and nearby customers.
- Existing buildings suitable for conversion.
CBRE reports relatively stronger supply growth in Milan and other secondary markets. That does not make every secondary site cheaper or better: weak connectivity, labour shortages, taxes or an uncertain grid can erase a land-cost advantage. CBRE
EU rules are moving from reporting toward performance
The Energy Efficiency Directive framework requires qualifying facilities to report energy-performance and sustainability indicators. Delegated Regulation (EU) 2024/1364 covers measures including energy use, power utilisation, temperature settings, waste-heat use, water use and renewable-energy use. EUR-Lex
The Commission is preparing a broader Data Centre Energy Efficiency Package, including an EU rating scheme and work toward minimum performance standards. Its planned framework addresses energy and water efficiency, clean-energy use, waste heat and flexibility; the roadmap indicated adoption of the rating scheme in 2026 and first labels in 2027. These are policy developments, not a final EU-wide operating standard. Commission consultation Commission roadmap
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.On-site power is a trade-off, not a universal fix
Generation, storage, demand response and flexible computing can shorten dependence on a major grid upgrade and improve resilience. They can also introduce fuel dependence, emissions, noise, safety requirements, maintenance and permitting risk.
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Emergency backup generators are not the same as continuous prime power. Their economics, emissions profile and regulation differ. A project should state whether on-site generation is backup, bridge capacity or the intended primary supply, and disclose fuel logistics and operating assumptions.
Sustainability must be measured at system level
Electricity
A lower power usage effectiveness (PUE) does not guarantee lower total consumption when IT demand grows faster than efficiency.
Water
Water use depends on climate, cooling architecture and operating conditions. Liquid cooling can support dense AI racks, but its water impact depends on the complete design rather than the label alone.
Carbon and flexibility
Assessment should include operational and embodied carbon, backup-fuel emissions, renewable procurement quality, additionality, hourly matching, equipment replacement and waste-heat recovery. A renewable certificate does not necessarily mean locally generated, additional or hourly matched electricity.
The Commission’s energy-system work also points toward flexibility, storage and better integration between digital infrastructure and the power system. European Commission Strategic roadmap
What investors and customers should verify
Developer and lender checklist
- Energised capacity, contracted future capacity and upgrade dependencies.
- Evidence behind the connection date and substation schedule.
- Permits, equipment lead times and commissioning milestones.
- Signed preleases, anchor-tenant credit and workload diversity.
- Maximum rack density, liquid-cooling capability and network design.
- Electricity, cooling, staffing, tax and backup-fuel economics.
- PUE, water use, renewable sourcing, waste heat and reporting readiness.
- Lease duration, tenant concentration, equipment obsolescence and refinancing risk.
Customer checklist
- Is capacity operational, under construction, permitted or merely proposed?
- What power density and cooling can be delivered on the required date?
- Are expansion rights, minimum commitments and take-or-pay terms clear?
- What do service-level agreements exclude?
- What are cross-connect, remote-hands, installation, network and egress charges?
- Are sovereignty, jurisdiction, disaster recovery and second-site requirements met?
- Do renewable and water claims include measurable definitions?
The practical buying question is not whether a provider has “space”. It is whether it can deliver the required power density, cooling, connectivity and expansion under a contract whose dates and risks are understood.
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